论文部分内容阅读
功能梯度形状记忆合金(Functionally Graded Shape Memory Alloy,简称FG-SMA)是一种新型功能梯度复合材料,它兼备功能梯度材料和形状记忆合金(Shape Memory Alloy)两种材料的优异特性。该文根据细观力学的理论,考虑材料的微观组成及相互作用,建立了一个适合于描述FG-SMA材料力学性能的细观力学本构模型,该模型可以准确的描述复杂载荷作用下FG-SMA的力学行为。应用这个模型,该文详细分析了一个由弹性材料和SMA组成的FG-SMA梁在轴力和弯矩共同作用下的受力变形行为。由数值算例可知,这种新型材料可显著减小载荷作用下的最大应力,避免材料由于应力过大而导致的破坏。此外,FG-SMA还具有一些其它独特的性能,可满足实际应用中一些特殊的需要。该文的研究结果可为该类材料的进一步研究提供基础,为该类材料的应用提供依据。
Functionally Graded Shape Memory Alloy (FG-SMA) is a new type of functionally graded composite material that combines the excellent properties of both functionally graded materials and Shape Memory Alloy materials. According to the theory of mesomechanics, considering the microstructure and interaction of materials, a mesomechanical constitutive model suitable for describing the mechanical properties of FG-SMA materials is established. The model can accurately describe the mechanical properties of FG- Mechanical behavior of SMA. Applying this model, this paper analyzes in detail the stress-strain behavior of a FG-SMA beam composed of elastic material and SMA under axial force and bending moment. Numerical examples show that this new type of material can significantly reduce the maximum stress under load, to avoid material damage due to excessive stress. In addition, FG-SMA also has some other unique features to meet the practical application of some special needs. The results of this paper can provide the basis for further research on this kind of material and provide the basis for the application of this kind of material.